kernel-source\Documentation\rapidio\rapidio.txt
Enumeration is performed by a master port if it is configured as a host port by
assigning a host destination ID greater than or equal to zero. The host
destination ID can be assigned to a master port using various methods depending
on RapidIO subsystem build configuration:
(a) For a statically linked RapidIO subsystem core use command line parameter
"rapidio.hdid=" with a list of destination ID assignments in order of mport
device registration. For example, in a system with two RapidIO controllers
the command line parameter "rapidio.hdid=-1,7" will result in assignment of
the host destination ID=7 to the second RapidIO controller, while the first
one will be assigned destination ID=-1.
(b) If the RapidIO subsystem core is built as a loadable module, in addition
to the method shown above, the host destination ID(s) can be specified using
traditional methods of passing module parameter "hdid=" during its loading:
- from command line: "modprobe rapidio hdid=-1,7", or
- from modprobe configuration file using configuration command "options",
like in this example: "options rapidio hdid=-1,7". An example of modprobe
configuration file is provided in the section below.
NOTES:
(i)
if "hdid=" parameter is omitted all available mport will be assigned destination ID = -1;
(ii)
the "hdid=" parameter in systems with multiple mports can have destination ID assignments omitted from the end of list (default = -1).
If the host device ID for a specific master port is set to -1, the discovery
process will be performed for it.
The enumeration and discovery routines use RapidIO maintenance transactions
to access the configuration space of devices.
